No, I don't think Outlook will prevent you to enter a duplicate number in any field. This would either have to tracked somehow. If you were to create your Contacts through VFP and sent to Outlook and you are using VFP8.0 you could use the autoincrement fields, or if you are in VFP7.0 that are easy ways to use the next available number.

>Hi Mike.
>If yiou are doing this in Outlook, and you try to add in another record with the same data, does it prevent you from doing so if that unique number is laready used ?
>
>Regards,
>
>Gerard
>
>
>>Is it possible to either programaticlly or otherwise set up contact data in Outlook with Unique numbers ?
>>
>>You can add a new field in Outlook, and either programatically via automation, manually through Outlook's interface you can put the unique number, and that way via automation you can link back the contact information to your master table.